After testing your medium-speed engine's...

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Question 1 of 2066636eef28f7522a1c520380

After testing your medium-speed engine's exhaust valve springs you find one with a spring constant that is lower than specified by design and a length that is reduced in length from that specified by design. What is the recommended course of action?

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Question 1 of 20

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🔍 Key Concepts

• Behavior of fatigued or weakened valve springs in medium-speed diesel engines • Risks of valve bounce, loss of seating force, and further metal fatigue • Proper vs. improper methods of correcting spring length and spring constant

💭 Think About

• If a valve spring has both reduced spring constant and shorter free length, what does that tell you about its condition and service life? • Would mechanically altering a fatigued spring (stretching, annealing, removing shims) truly restore its original strength and fatigue resistance? • What other engine components could be affected if a weakened spring has allowed the valve to bounce or not seat properly?

✅ Before You Answer

• Confirm which options involve re-using the same weakened spring versus installing a new spring. • Consider manufacturer and class/USCG guidance: are valve springs typically repaired/modified, or are they renewed when out of spec? • Think about valve train damage from valve bounce – which parts (like cam and follower) should be inspected if an exhaust valve spring has been operating below spec?

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